<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr " v-for="(item,index) in fruitList" :key="item.id" :class="{ active:item.isChecked}">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button :disabled="item.num <= 1 " class="decrease" @click="delTotal(item.id)"> - </button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="addTotal(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{item.num*item.price}}</div>
            <div class="td"><button @click="delBtn(item.id)">删除</button></div>
          </div>

          <!-- <div class="tr">
            <div class="td"><input type="checkbox" /></div>
            <div class="td"><img src="./img/荔枝.png" alt="" /></div>
            <div class="td">7</div>
            <div class="td">
              <div class="my-input-number">
                <button disabled class="decrease"> - </button>
                <span class="my-input__inner">1</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">14</div>
            <div class="td"><button>删除</button></div>
          </div> -->
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom" v-if="fruitList.length > 0">
        <!-- 全选 -->
        <label class="check-all">
          <!-- 
            1.获取全选按钮的选中的状态
            2.改变小选的选中状态
          -->
          <input type="checkbox" v-model="allSelected" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算({{totalCount}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-if="fruitList <= 0">🛒空空如也</div>
  </div>
  <script src="../vue.js"></script>
  <script>
    const defaultFruitList = [
      {
        id: 1,
        icon: './img/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: './img/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: './img/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: './img/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: './img/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('fList')) || defaultFruitList
      },
      methods: {
        delTotal(id) {
          const fruit = this.fruitList.find(item => item.id === id)
          fruit.num--

        },
        addTotal(id) {
          const fruit = this.fruitList.find(item => item.id === id)
          fruit.num++
        },
        delBtn(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
      },
      // 计算属性
      computed: {
        // 实现全选和小选
        allSelected: {
          get() {
            return this.fruitList.every(item => item.isChecked)
          },
          set(value) {
            this.fruitList.forEach(item => { item.isChecked = value })
          }
        },

        // 计算选中的总数量
        totalCount() {
          return this.fruitList.reduce((preSum, item) => {
            if (item.isChecked == true) {
              return preSum + item.num
            } else {
              return preSum
            }
          }, 0)
        },
        // 计算选中的总价格
        totalPrice() {
          return this.fruitList.reduce((preSum, item) => {
            if (item.isChecked == true) {
              return preSum + item.num * item.price
            } else {
              return preSum
            }
          }, 0)
        }

      },
      watch: {
        fruitList: {
          deep: true,
          handler(newValue) {
            localStorage.setItem('fList', JSON.stringify(newValue))
            console.log(newValue);
          }
        }
      }
    })
  </script>
</body>

</html>